Reland of "[heap] Parallel newspace evacuation, semispace copy, and compaction \o/"

src/heap/store-buffer-inl.h

Index: src/heap/store-buffer-inl.h
diff --git a/src/heap/store-buffer-inl.h b/src/heap/store-buffer-inl.h
index e11ad87087ccf039b6076a76d3a408a66a85d6fa..454b2c22929ae41c72bdba838f1a10302fe715aa 100644
--- a/src/heap/store-buffer-inl.h
+++ b/src/heap/store-buffer-inl.h
@@ -26,12 +26,6 @@ void StoreBuffer::Mark(Address addr) {
 }
 
 
-inline void StoreBuffer::MarkSynchronized(Address addr) {
-  base::LockGuard<base::Mutex> lock_guard(&mutex_);
-  Mark(addr);
-}
-
-
 void StoreBuffer::EnterDirectlyIntoStoreBuffer(Address addr) {
   if (store_buffer_rebuilding_enabled_) {
     SLOW_DCHECK(!heap_->code_space()->Contains(addr) &&
@@ -48,6 +42,22 @@ void StoreBuffer::EnterDirectlyIntoStoreBuffer(Address addr) {
     }
   }
 }
+
+void LocalStoreBuffer::Record(Address addr) {
+  if (top_->is_full()) top_ = new Node(top_);
+  top_->buffer[top_->count++] = addr;
+}
+
+void LocalStoreBuffer::Process(StoreBuffer* store_buffer) {
+  Node* current = top_;
+  while (current != nullptr) {
+    for (int i = 0; i < current->count; i++) {
+      store_buffer->Mark(current->buffer[i]);
+    }
+    current = current->next;
+  }
+}
+
 }  // namespace internal
 }  // namespace v8